Fans have been speculating on this Instagram picture of Kylie's Christmas tree (Image: Instagram/kyliejenner)

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"When are you going to announce your pregnancy?" one fan commented on a picture of her 20ft Christmas tree on Instagram.

"Look I am wondering if the pregnancy rumors are real?" another asked.

While another impatient fan admitted: "Just zoomed in on the reflection of one of the ornaments to see if I could spot a bump I need to quit."

Khloe Kardashian admitted she was "so nervous" to go public with her baby news.

The reality star took to Twitter to thank fans for their well wishes after finally confirming her much-speculated pregnancy on Wednesday.

The 33-year-old wrote: "I was so nervous to post our announcement but WOWWW I am overwhelmed with the response by you guys!!! Thank you! Thank you! I love you guys!!"

She added that she "still can't believe it" with an emoji of a pregnant woman and a heart.

Khloe will welcome her first child with boyfriend Tristan Thompson (Image: Instagram)

Khloe revealed her happy news on Instagram with beautiful bump picture, telling her fans: "My greatest dream realized! We are having a baby!"

Hinting that she thought it might never happen for her, Khloe - who tried and failed to conceive with ex-husband Lamar Odom - uploaded a shot of herself and boyfriend Tristan Thompson cradling her huge bump on December 20.

"I had been waiting and wondering but God had a plan all along. He knew what He was doing," she captioned the stunning image.

"I simply had to trust in Him and be patient. I still at times can't believe that our love created life! Tristan, thank you for loving me the way that you do!" she continued.

"Thank you for treating me like a Queen! Thank you for making me feel beautiful at all stages!" she wrote.

"Tristan, most of all, Thank you for making me a MOMMY!!! You have made this experience even more magical than I could have envisioned! I will never forget how wonderful you've been to me during this time! Thank you for making me so happy my love!

"Thank you to everyone for the love and positive vibes!"

Khloe Kardashian and Tristan (Image: Instagram/ Khloe Kardashian)

The reality star has kept fans guessing for months over whether or not she's expecting.

And in the touching post, she revealed that she didn't confirm or deny because they wanted to bask in their happy news privately.

"I know we've been keeping this quiet but we wanted to enjoy this between our family and close friends as long as we could privately," she said.

As for the gender, according to Us Weekly, the couple are expecting a boy.

Despite the wait, fans were overjoyed for Khloe, especially after all that she's been through.

"After watching how much Khloe Kardashian struggled a few years back on kuwtk about getting pregnant, I’m so happy for her & I feel like everything does happen for a reason and she’s finally gonna get her baby!" one wrote.

After suffering infertility with Lamar, the last season of Keeping Up With The Kardashians saw her get the all clear from doctors, who told her she could have children after all.

Speaking in an interview in August, she revealed she 'definitely' wanted little ones with NBA player Tristan, who has a one-year-old son Prince Oliver with his ex, Jordan Craig.